Fig. 3: Control alignment of top hBN and bottom hBN using the neighboring hBN surface.
From: Controlled alignment of supermoiré lattice in double-aligned graphene heterostructures
a Schematics of conventional pick-up and flip-over technique for double alignment. b, c Schematics of hBN/graphene/hBN heterostructures with odd (b) and even (c) hBN layers. Lattice models at the high symmetry points of the moiré pattern show the atomic arrangement for each. Purple shading in (c) denotes the overlap of boron (red) and nitrogen (blue) in the T-hBN and B-hBN. d Optical images of fractured hBN and alignment of T-hBN and B-hBN using the flip-over technique. The black lines profile the T-hBN, and the red lines profile the B-hBN. e Maps of the FWHM of Raman 2D-band of graphene for the single and double alignment using the hBN in (d). f Optical images of two neighboring hBN and one of hBN have 60° with PCA can also be aligned using the flip-over technique. g Maps of the FWHM of Raman 2D-band of graphene for the single and double alignment using the hBN in (f). Scale bars, 10 µm (d, f); 1 µm (e, g).
